pygsti.algorithms.robust_phase_estimation

Robust Phase Estimation platform agnostic portion

Module Contents

Classes

RobustPhaseEstimation

Runs the non-adaptive RPE algorithm.

class pygsti.algorithms.robust_phase_estimation.RobustPhaseEstimation(q)

Bases: object

Runs the non-adaptive RPE algorithm.

Runs the non-adaptive RPE algorithm using a dictionary of measurement results, Q.raw_angles, containing the angles calculated from the probabilities:

P^{γ’γ}_{Nₖs} = |<γ’ y| U^Nₖ |γ x>|² = |<γ’ x| U^Nₖ |-γ y>|² = (1 ± sin(θ))/2 P^{γ’γ}_{Nₖc} = |<γ’ x| U^Nₖ |γ x>|² = |<γ’ y| U^Nₖ | γ y>|² = (1 ± cos(θ))/2

Expect measured[Nₖ] = θ.

Overview:

At each generation, use the previous estimated angle to select the 2π/L window (of which the measurements cannot distinguish).

Returns an result object. theta is the estimated angle, angle_estimates are the estimates from each generation.

Parameters

q<TODO typ>

<TODO description>

theta_n(n)

Returns the equivalence class of the measurement Θ.

By definition, Θ is equivalent when any integer multiple of 2π/N is added to it.

Parameters

nint

The RPE ‘N’ parameter, used to determine the equivalence class.

Returns

float